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02-16-2009, 04:14 PM
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CC Member
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Join Date: Jun 2008
Cobra Make, Engine:
Posts: 10
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Not Ranked
Spark Plug Recommendation
Would appreciate spark plug recommendations for my 347 stoker (302 block). I plan to add a MSD (6AL) next month and will use Ford Racing 9 mm wires. I do not race/autocross, just cruising.
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02-16-2009, 04:25 PM
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CC Member
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Join Date: Jun 2006
Location: pottstown,
pa
Cobra Make, Engine: era 289 FIA #2112
Posts: 326
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Not Ranked
what heads are you using?
__________________
live for the moment or it may pass you by
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02-16-2009, 04:29 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
Accel #416 for aluminum, 276 for iron.
__________________
Chas.
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02-16-2009, 06:02 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,448
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Not Ranked
I use standard Autolites, 3924. Cheap, easy to come by, dead on relaiable. And <$2 each.
There's no magic in a spark plug.
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02-16-2009, 06:23 PM
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CC Member
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Join Date: Jun 2008
Cobra Make, Engine:
Posts: 10
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Not Ranked
Plugs
I bought the car second hand and from a guy who had very little in the way of engine build documentation. To compound the issue I called the builder and he could only confirm that the 347 stroker had oil rings that did not intrude into the wrist pin area (a problem on earlier 347s). The good news is I put about 1300 miles on the engine and it does not leak or burn a drop of oil and makes good power. Overall, I like the car and engine, I just do not want to replace everything that originally came with the car in 2004. It is real difficult to upgrade when you do not know what you have. Not sure what heads are on it, wonder if there is a common area where they may have a number or other identifying marks? |
02-16-2009, 06:57 PM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Not Ranked
Quote:
Originally Posted by bobcowan
I use standard Autolites, 3924. Cheap, easy to come by, dead on relaiable. And <$2 each.
There's no magic in a spark plug.
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The 3924 Autolite spark plugs are listed as the standard spec for my Roush 402, but the plugs that were installed when I took delivery are Motorcraft AGSP32C's.
I was planning on changing the plugs on my car this spring and bought the 3924's before realizing they had installed Motorcraft plugs. I now have a set of both (Motorcraft and Autolite). I'll probably just use the Motorcraft plugs.
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
Last edited by Got the Bug; 02-16-2009 at 06:59 PM..
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02-16-2009, 10:11 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,448
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Not Ranked
AGSP and 3924 are the same plug. One is Motorcraft, the other is Autolite. They are interchangable.
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02-17-2009, 06:17 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
I just pulled Autolite plugs from my 347 (removed headers). Where the porcelan(sp?) was exposed - not covered with the plug wire, the plugs are black. Every plug is black all the way around 360^. At first I thought maybe they were leaking combustion, but it will not wipe off. Not sure what to make of it. Anyone else ever have this happen?
I think I will be putting motorcraft back in.
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02-18-2009, 02:17 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,448
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Not Ranked
Mine always look that way in all my vehicles. I never worried about it.
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02-18-2009, 02:24 PM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
Mine look that way on my FE427 and on my sb. They still run like stripped A$$ Apes! 
__________________
Sunshine, Asphalt and no stop signs...Perfect
"Let's roll"
"Be part of Something Good
......Leave Something Good Behind!"
from CD "Long Road Out of Eden"
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02-18-2009, 03:33 PM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Not Ranked
Be careful about installing the plugs, use a torque wrench. 10 to 15 Ft-Lbs I would imagine. Use a no-bind compound made for plugs.
The last Roush SB engine I looked at had Motorcraft SP-447 (AGSF32C) plugs.
Bob
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02-18-2009, 09:09 PM
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Beam Me Up Scottie
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Join Date: Aug 2004
Location: Squantum (part of Quincy),
MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
Posts: 7,592
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Not Ranked
__________________
Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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